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Accumulated Other Comprehensive Income (Loss) - Reconciliation of Transactions Affecting Accumulated Other Comprehensive Income (Loss) Included in Shareholders' Equity (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at beginning of period $ (2,322) $ (1,404)
Revaluation of tax related balances   (300)
Changes in unrealized gains and losses 785 (776)
Changes in unrealized gains and losses (74) 86
Changes in unrealized gains and losses   (3)
Changes in unrealized gains and losses 711 (693)
Foreign currency translation adjustment 16 13
Reclassification to earnings of realized gains and losses 8 29
Applicable income taxes (186) 162
Balance at end of period (1,773) (2,193)
Foreign Currency Translation [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at beginning of period (84) (69)
Revaluation of tax related balances   (13)
Foreign currency translation adjustment 16 13
Applicable income taxes (4) (7)
Balance at end of period (72) (76)
Unrealized Gains (Losses) on Retirement Plans [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at beginning of period (1,418) (1,066)
Revaluation of tax related balances   (229)
Changes in unrealized gains and losses   (3)
Reclassification to earnings of realized gains and losses 22 34
Applicable income taxes (6) (7)
Balance at end of period (1,402) (1,271)
Unrealized Gains (Losses) on Derivative Hedges [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at beginning of period 112 71
Revaluation of tax related balances   15
Changes in unrealized gains and losses (74) 86
Reclassification to earnings of realized gains and losses (8) 3
Applicable income taxes 21 (23)
Balance at end of period 51 152
Unrealized Gains (Losses) on Investment Securities Transferred From Available For Sale to Held To Maturity [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at beginning of period 14 17
Revaluation of tax related balances   4
Reclassification to earnings of realized gains and losses (1) (3)
Applicable income taxes   1
Balance at end of period 13 19
Unrealized Gains (Losses) on Investment Securities Available-For-Sale [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at beginning of period (946) (357)
Revaluation of tax related balances   (77)
Changes in unrealized gains and losses 785 (776)
Reclassification to earnings of realized gains and losses (5) (5)
Applicable income taxes (197) 198
Balance at end of period $ (363) $ (1,017)